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This week it's the finals of Newsround's inventions competition, You Too Can Be An Absolute Genius.

All week on Newsround the finalists are showcasing their inventions to a panel of clever judges and on Friday you'll find out who's won.

The first group of finalists have already demonstrated their invention, the magno-stick.

Now it's up to the second of our four groups to show how they hope to solve a problem all-too-familiar to anyone with a bunk bed...